[media] Spec: document CREATE_BUFS behavior if count == 0
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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@ -97,7 +97,13 @@ information.</para>
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<row>
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<row>
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<entry>__u32</entry>
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<entry>__u32</entry>
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<entry><structfield>count</structfield></entry>
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<entry><structfield>count</structfield></entry>
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<entry>The number of buffers requested or granted.</entry>
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<entry>The number of buffers requested or granted. If count == 0, then
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<constant>VIDIOC_CREATE_BUFS</constant> will set <structfield>index</structfield>
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to the current number of created buffers, and it will check the validity of
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<structfield>memory</structfield> and <structfield>format.type</structfield>.
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If those are invalid -1 is returned and errno is set to &EINVAL;,
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otherwise <constant>VIDIOC_CREATE_BUFS</constant> returns 0. It will
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never set errno to &EBUSY; in this particular case.</entry>
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</row>
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</row>
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<row>
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<row>
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<entry>__u32</entry>
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<entry>__u32</entry>
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